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[原始] 曼哈顿DS数学题求助~

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发表于 2017-9-19 13:43:24 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
8 cities, including Memphis, are finalists to be chosen to host a political convention. Exactly one city will be chosen to host the convention. What is the probability that Memphis is not chosen?

(1) The probability that any one of the 8 cities does not win the competition is 7/8.

(2) The probability that Memphis wins the competition is 1/8.

  • AStatement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
  • BStatement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
  • CBoth statements TOGETHER are sufficient, but NEITHER one ALONE is sufficient.
  • DEACH statement ALONE is sufficient.
  • EStatements (1) and (2) TOGETHER are NOT sufficient.
正确答案: D


不理解为什么(1)正确,感觉和题干(Exactly one city will be chosen to host the convention.)矛盾。

谢谢各位啦~

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